13888681 has 4 divisors (see below), whose sum is σ = 13897872. Its totient is φ = 13879492.

The previous prime is 13888669. The next prime is 13888723. The reversal of 13888681 is 18688831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 13888681 - 2¹¹ = 13886633 is a prime.

It is a super-2 number, since 2×13888681² = 385790919839522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13888181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1735 + ... + 5548.

It is an arithmetic number, because the mean of its divisors is an integer number (3474468).

Almost surely, 2^13888681 is an apocalyptic number.

It is an amenable number.

13888681 is a deficient number, since it is larger than the sum of its proper divisors (9191).

13888681 is an equidigital number, since it uses as much as digits as its factorization.

13888681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9190.

The product of its digits is 73728, while the sum is 43.

The square root of 13888681 is about 3726.7520711740. The cubic root of 13888681 is about 240.3737290679.

The spelling of 13888681 in words is "thirteen million, eight hundred eighty-eight thousand, six hundred eighty-one".